* {
  /* 初始化 */
  margin: 0;
  padding: 0;
}
body {
  /* 100%窗口高度 */
  min-height: 100vh;
  /* 弹性布局 水平+垂直居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  /* 渐变背景 */
  background: linear-gradient(to top, #d3e7ff, #f3f8ff);
  /* 溢出隐藏 */
  overflow: hidden;
}
.container {
  /* 弹性布局 横向排列 */
  display: flex;
}
.card {
  width: 300px;
  height: 380px;
  background-color: #999;
  border-radius: 10px;
  margin: 0 15px;
  /* 投影 */
  box-shadow: 0 80px 60px -60px #000;
  display: flex;
  justify-content: center;
  align-items: center;
  /* 相对定位 */
  position: relative;
  overflow: hidden;
  /* 设置过渡效果 */
  transition: 0.8s;
}
.card .border {
  width: 290px;
  height: 370px;
  border-radius: 10px;
  /* 设置boder变化时的过渡效果 */
  transition: border 1s;
}
.card .border:hover {
  border: 1px solid #fff;
}
.card h2 {
  color: #fff;
  font-size: 30px;
  margin: 20px;
  /* 字间距 */
  letter-spacing: 8px;
  /* 默认隐藏 */
  opacity: 0;
  /* 设置不透明度变化时的过渡效果 */
  transition: opacity 1s;
}
.card .icons {
  color: #fff;
  font-size: 18px;
  /* 弹性布局 垂直排列 */
  display: flex;
  flex-direction: column;
  /* 平均分配高度给每一个子元素 */
  justify-content: space-around;
  align-items: center;
  width: 50px;
  height: 150px;
  /* 绝对定位 */
  position: absolute;
  bottom: 20px;
}
.card .fa {
  /* 默认隐藏 */
  opacity: 0;
  /* 过渡效果 */
  transition: opacity 1s;
}
/* 卡片一 */
.card:nth-child(1) {
  background: url("../../images/op/black/1.jpg") no-repeat;
  background-position: right bottom;
  background-size: 300px;
}
.card:nth-child(1):hover {
  background-position: left center;
  background-size: 500px;
}
.card:nth-child(1):hover h2,
.card:nth-child(1):hover .fa {
  opacity: 1;
}
/* 卡片二 */
.card:nth-child(2) {
  background: url("../../images/op/black/2.jpg") no-repeat;
  background-position: right bottom;
  background-size: 300px;
}
.card:nth-child(2):hover {
  background-position: left center;
  background-size: 500px;
}
.card:nth-child(2):hover h2,
.card:nth-child(2):hover .fa {
  opacity: 1;
}
/* 卡片三 */
.card:nth-child(3) {
  background: url("../../images/op/black/3.jpg") no-repeat;
  background-position: right bottom;
  background-size: 300px;
}
.card:nth-child(3):hover {
  background-position: left center;
  background-size: 500px;
}
.card:nth-child(3):hover h2,
.card:nth-child(3):hover .fa {
  opacity: 1;
}
